Probable Base Number for Genus x = 10
T. grazielae n= 10 ref Robinson et al. 1989
T. prancii n= 10 ref Robinson et al. 1989
T. salviifolia n= 10 + 1 or 2 I ref Robinson et al. 1989
T. scottmorii n= 10 ref Robinson et al. 1989
T. villosa n= 40 I (maybe 2n=20 II) ref Robinson et al. 1989
References
Robinson, H., A. M. Powell, G. D. Carr, R. M. King, and J. F. Weedin. 1989. Chromosome numbers
in Compositae, XVI: Eupatorieae II. Annals of the Missouri Botanical Garden 76: 1004-1011.